First we need to check if ActiveDirectory module is already installed on a computer or not by running Get-Module PS command. From the output we can see that is not listed.

You can download “Remote Server Administration Tools for Windows 10” from the link below, or  starting with Windows 10 October 2018 Update, RSAT is included as a set of “Features on Demand” in Windows 10 itself.

https://www.microsoft.com/en-us/download/details.aspx?id=45520

After installing RSAT we can run and verify that ActiveDirectory module is listed by running the same command Get-Module